/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
 *
 *  (C) 2003 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"

/*
static char MTEST_Descrip[] = "Simple intercomm barrier test";
*/

/* This only checks that the Barrier operation accepts intercommunicators.
   It does not check for the semantics of a intercomm barrier (all processes
   in the local group can exit when (but not before) all processes in the 
   remote group enter the barrier */
int main( int argc, char *argv[] )
{
    int errs = 0, err;
    int leftGroup;
    MPI_Comm comm;
    MPI_Datatype datatype;

    MTest_Init( &argc, &argv );

    datatype = MPI_INT;
    /* Get an intercommunicator */
    while (MTestGetIntercomm( &comm, &leftGroup, 4 )) {
        if (comm == MPI_COMM_NULL)
            continue;

	/* To improve reporting of problems about operations, we
	   change the error handler to errors return */
	MPI_Comm_set_errhandler( comm, MPI_ERRORS_RETURN );
	if (leftGroup) {
	    err = MPI_Barrier( comm );
	    if (err) {
		errs++;
		MTestPrintError( err );
	    }
	}
	else {
	    /* In the right group */
	    err = MPI_Barrier( comm );
	    if (err) {
		errs++;
		MTestPrintError( err );
	    }
	}
	MTestFreeComm( &comm );
    }

    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;
}
